4095km
Explanation:
Given parameters:
Starting time = 7 o'clock
Stopping time = 11hrs 30min
Speed = 910km/hr
Unknown:
Distance covered = ?
Solution:
Speed is the rate of change of distance with time.
It is a scalar quantity that is with respect with magnitude but no direction.
Speed = 
Distance = Speed x time
Time taken = time between 11hrs 30min and 7 o'clock = 4.5hrs
Input the parameters:
Distance = 910km/hr x 4.5hrs = 4095km
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Answer:

Explanation:
The relationship between the refractive index and the critical angle is given as follows:

where,
η = refractive index = 1.67
θc = critical angle =?
Therefore,


Force = mass * acceleration
acceleration = change_in_velocity / time
so:
force = 740 kg * (19 m/s - 0 m/s) / 2.0 s
= 740 * 19 / 2 kg m per second^{2}
= 7030 kg m per second^{2}
= 7030 newtons of force